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JMockit Coverage is a code coverage tool with several metrics (line, path, data) capable of generating HTML reports. It is designed with ease of use in mind, avoiding the need for complex configuration. Instead, smart (but overridable) defaults are employed, such as the selection of which classes to consider for coverage, and where to find sources files for report generation.

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/*
 * Copyright (c) 2006-2015 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage.lines;

import java.io.*;
import java.util.*;

import org.jetbrains.annotations.*;

import mockit.coverage.*;

public class LineSegmentData implements Serializable
{
   private static final long serialVersionUID = -6233980722802474992L;
   private static final int MAX_CALL_POINTS = Integer.parseInt(Configuration.getProperty("maxCallPoints", "10"));

   // Constant data:
   private boolean unreachable;
   private boolean empty;

   // Runtime data:
   int executionCount;
   @Nullable private List callPoints;

   public final void markAsUnreachable() { unreachable = true; }

   public final boolean isEmpty() { return empty; }
   final void markAsEmpty() { empty = true; }

   final boolean acceptsAdditionalCallPoints()
   {
      return callPoints == null || callPoints.size() < MAX_CALL_POINTS;
   }

   final int registerExecution(@Nullable CallPoint callPoint)
   {
      int previousExecutionCount = executionCount++;

      if (callPoint != null) {
         addCallPoint(callPoint);
      }

      return previousExecutionCount;
   }

   private void addCallPoint(@NotNull CallPoint callPoint)
   {
      if (callPoints == null) {
         callPoints = new ArrayList(MAX_CALL_POINTS);
      }

      for (int i = callPoints.size() - 1; i >= 0; i--) {
         CallPoint previousCallPoint = callPoints.get(i);

         if (callPoint.isSameLineInTestCode(previousCallPoint)) {
            previousCallPoint.incrementRepetitionCount();
            return;
         }
      }

      callPoints.add(callPoint);
   }

   public final boolean containsCallPoints() { return callPoints != null; }
   @Nullable public final List getCallPoints() { return callPoints; }

   public final int getExecutionCount() { return executionCount; }
   final void setExecutionCount(int executionCount) { this.executionCount = executionCount; }

   public final boolean isCovered() { return unreachable || !empty && executionCount > 0; }

   final void addExecutionCountAndCallPointsFromPreviousTestRun(@NotNull LineSegmentData previousData)
   {
      executionCount += previousData.executionCount;

      if (previousData.callPoints != null) {
         if (callPoints != null) {
            callPoints.addAll(0, previousData.callPoints);
         }
         else {
            callPoints = previousData.callPoints;
         }
      }
   }

   void reset() { executionCount = 0; }
}